<template>
  <div class="app-header-sticky"  :class="{show:y>=78}">
    <div class="container" v-show="y>=78">
      <router-link to="/" class="logo"></router-link>
      <app-header-nav></app-header-nav>
      <div class="right">
        <RouterLink to="/" >品牌</RouterLink>
        <RouterLink to="/" >专题</RouterLink>
      </div>
    </div>
  </div>
</template>

<script>
// import { onMounted, ref } from 'vue'
import { useWindowScroll } from '@vueuse/core'
// import AppHeaderNav from '@/components/app-header-nav'
import appHeaderNav from './app-header-nav.vue'
export default {
  components: { appHeaderNav },
  name: 'AppHeaderSticky',

  setup () {
    // 定义响应式数据，y，当y>78px时，添加类名
    // const y = ref(0)

    // onMounted(() => {
    //   window.onscroll = () => {
    //     const scrollTop = document.documentElement.scrollTop

    //     y.value = scrollTop
    //   }
    // })

    const { y } = useWindowScroll()

    return { y }
  }

}
</script>

<style lang="less" scoped>
.app-header-sticky {
  width: 100%;
  height: 80px;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 999;
  background-color: #fff;
  border-bottom: 1px solid #e4e4e4;

  // 默认移出外面，完全透明，滚动到一定高度时滑出贴顶
  transform: translateY(-100%);
  opacity: 0;
  &.show {
    transition: all 0.3s linear;
    transform: none;
    opacity: 1;
  }
  .container {
    display: flex;
    align-items: center;
  }
  .logo {
    width: 200px;
    height: 80px;
    background: url(../assets/images/logo.png) no-repeat  right 2px;
    background-size: 160px auto;
  }
  .right {
    width: 220px;
    display: flex;
    text-align: center;
    padding-left: 40px;
    border-left: 2px solid @xtxColor;
    a {
      width: 38px;
      margin-right: 40px;
      font-size: 16px;
      line-height: 1;
      &:hover {
        color: @xtxColor;
      }
    }
  }
}
</style>
